Systems and Techniques for Reducing Power Consumption in a Mobile Computing Device

ABSTRACT

Various embodiments are directed to systems and techniques for reducing power consumption in a mobile computing device. In one or more embodiments, a mobile computing device may be arranged to determine a user environment based on detected antenna impedance or detected current. After the user environment is determined, the mobile computing device may confirm that total radiation power (TRP) for the mobile computing device at an initial conducted power level exceeds the minimum TRP threshold required by the network carrier to receive acceptable quality of service (QoS). Based on the excess TRP for the particular user environment, the mobile computing device may determine a reduced conducted power level to be input to an antenna system. Accordingly, significant power savings may be achieved. To save additional power, the mobile computing device may automatically adjust and/or improve antenna impedance matching based on user environment allowing a further reduction in conducted power. Other embodiments are described and claimed.

BACKGROUND

A mobile computing device typically operates using one or moretransceivers and one or more antennas to provide voice and datacommunications functionality. Antenna impedance mismatch may result indropped calls and increased power consumption. Antenna impedancemismatch worsens when the mobile computing device is in talk positionbecause the head of a user is a lossy dielectric material and typicallyabsorbs 1-6 dB energy radiating from the mobile computing device. As aresult, users may have more dropped calls and consume more power whenusing a mobile computing device in talk position than in a hands-freeenvironment.

Battery life is reduced when more power is drained from the battery. Asthe form factors for mobile computing devices continue to decrease, lessspace is available for a larger battery to extend talk time.Accordingly, there exists the need for improved systems and techniquesfor reducing power consumption in a mobile computing device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates one embodiment of a mobile computing device.

FIG. 2 illustrates one embodiment of a mobile computing device.

FIG. 3 illustrates one embodiment of a radio sub-system.

FIG. 4 illustrates one embodiment of antenna impedance and conductedpower for different user environments.

FIG. 5 illustrates one embodiment of a radio sub-system.

FIG. 6 illustrates one embodiment of a radio sub-system.

FIG. 7 illustrates one embodiment of a radio sub-system.

FIG. 8 illustrates one embodiment of a power control logic flow.

DETAILED DESCRIPTION

Various embodiments are directed to systems and techniques for reducingpower consumption in a mobile computing device. In one or moreembodiments, a mobile computing device may be arranged to determine auser environment based on detected antenna impedance or detectedcurrent. After the user environment is determined, the mobile computingdevice may confirm that total radiation power (TRP) for the mobilecomputing device at an initial conducted power level exceeds the minimumTRP threshold required by the network carrier to receive acceptablequality of service (QoS). Based on the excess TRP for the particularuser environment, the mobile computing device may determine a reducedconducted power level to be input to an antenna system. Accordingly,significant power savings may be achieved. To save additional power, themobile computing device may automatically adjust and/or improve antennaimpedance matching based on user environment allowing a furtherreduction in conducted power. Other embodiments are described andclaimed.

FIG. 1 illustrates a mobile computing device 100 in accordance with oneor more embodiments. The mobile computing device 100 may be implementedas a combination handheld computer and mobile telephone, sometimesreferred to as a smart phone. Examples of smart phones include, forexample, Palm® products such as Palm® Treo™ smart phones. Although someembodiments may be described with the mobile computing device 100implemented as a smart phone by way of example, it may be appreciatedthat the embodiments are not limited in this context. For example, themobile computing device 100 may comprise, or be implemented as, any typeof wireless device, mobile station, or portable computing device with aself-contained power source (e.g., battery) such as a mobile telephone,personal digital assistant (PDA), combination mobile telephone/PDA,handheld computer, gaming console, mobile unit, subscriber station, gamedevice, media player, pager, messaging device, data communicationdevice, or any other suitable computing or processing system inaccordance with the described embodiments.

Mobile computing device 100 may comprise a housing 102. Housing 102 mayinclude one or more materials such as plastic, metal, ceramic, glass,carbon fiber, various polymers, and so forth, suitable for enclosing andprotecting the internal components of mobile computing device 100.Housing 102 may be used to encapsulate various internal components formobile computing device 100 such as a removable and rechargeablebattery, processors, memory, transceivers, printed circuit boards,antennas, and so forth. In various embodiments, housing 102 may have ashape, size and/or form factor capable of being held with an averagehuman hand, such as a handheld computer, cellular telephone, PDA,combination PDA/cellular telephone, smart phone, and so forth.

Mobile computing device 100 may comprise various input/output (I/O)devices, such as an alphanumeric keyboard, alphanumeric keypad, numerickeys, keys, buttons, switches, rocker switches, multi-directional rockerswitches, a microphone, an audio headset, a camera, a touch-sensitivedisplay screen, a stylus, and so forth. As shown in FIG. 1, for example,mobile computing device 100 may comprise an alphanumeric keyboard 104having a QWERTY key layout and an integrated number dial pad. Mobilecomputing device 100 may comprise various buttons such as, for example,a volume button 106, a customizable button 108, a left action button110, a right action button 112, a phone/send button 114, a power/endbutton 116, a start button 118, an OK button 120, and a navigationbutton 122. Mobile computing device 100 may comprise an audio port 124to connect an audio headset, a microphone 126, a ringer on/off switch128 having a vibrate mode, and an expansion slot 130 to support amultimedia and/or memory card, for example.

Mobile computing device 100 may comprise a serial connection port 132,an infrared port 134, integrated Bluetooth® wireless capability, and/orintegrated 802.11x (WiFi) wireless capability, to enable wired (e.g.,USB cable) and/or wireless connection to a local computer system, suchas a local personal computer (PC). In various implementations, mobilecomputing device 100 may be arranged to transfer and/or synchronizeinformation with the local computer system.

Mobile computing device 100 may comprise a display 138. Display 138 maycomprise any suitable display unit for displaying informationappropriate for mobile computing device 100. In addition, display 138may be implemented as an additional I/O device, such as a touch screen,touch panel, touch screen panel, and so forth. In one embodiment, forexample, the display 138 may be implemented by a liquid crystal display(LCD) such as a touch-sensitive color (e.g., 16-bit color) thin-filmtransistor (TFT) LCD screen. In some cases, the touch-sensitive LCD maybe used with a stylus and/or a handwriting recognizer program.

Mobile computing device 100 may comprise an antenna system including oneor more antennas. The antennas may be internal antennas, externalantennas, or a combination of both. In one embodiment, for example, theantenna system may include an external antenna 136 implemented as a stubantenna, a whip antenna, an extendable antenna, and so forth. Theantenna system may also include one or more internal antennas, such as aplanar inverted-F antenna, a planar inverted-L antenna, an inverted-Fantenna with a helical structure, an inverted-L antenna with a helicalstructure, a monopole antenna, a meandered monopole antenna, a dipoleantenna, a balanced antenna, a printed helical antenna, a chip antenna,a ceramic antenna, and so forth. The embodiments are not limited in thiscontext.

In various embodiments, mobile computing device 100 may be arranged toperform power saving techniques. In one or more embodiments, the mobilecomputing device 100 may be arranged to determine a user environmentbased on detected antenna impedance or detected current, confirm thatTRP at an initial conducted power level exceeds a minimum TRP threshold,determine a reduced conducted power level to be input to the antennasystem based on the excess TRP for the particular user environment. Tosave additional power, the mobile computing device 100 may improveantenna impedance matching based on user environment allowing a furtherreduction in conducted power. Systems and techniques for reducing powerin mobile computing device 100 may be described in more detail withreference to FIGS. 2-5.

FIG. 2 illustrates a block diagram of mobile computing device 100 asdescribed with reference to FIG. 1. As shown in FIG. 2, mobile computingdevice 100 may include a radio sub-system 200 and a processingsub-system 202. Radio sub-system 200 may perform voice and/or datacommunications operations on behalf of mobile computing device 100, andprocessing sub-system 202 may provide processing or computing resourcesto mobile computing device 100. Radio sub-system 200 and processingsub-system 202 may be coupled to each other and/or communicate using abus 204. The bus 204 may be implemented by various interfaces such asone or more universal serial bus (USB) interfaces, micro-USB interfaces,universal asynchronous receiver-transmitter (UART) interfaces, generalpurpose input/output (GPIO) interfaces, control/status lines,control/data lines, audio lines, as well as others.

Mobile computing device 100 also may comprise a power managementsub-system 206. Power management sub-system 206 may manage power formobile computing device 100, including radio sub-system 200, processingsub-system 202, and other elements of mobile computing device 100. Forexample, power management sub-system 206 may include one or morebatteries to provide direct current (DC) power, and one or morealternating current (AC) interfaces to draw power from an AC powersource, such as a standard AC main power supply.

Radio sub-system 200 may provide voice and/or data communicationsfunctionality in accordance with different types of cellular telephonesystems. Examples of cellular telephone systems may include CodeDivision Multiple Access (CDMA) systems, Global System for MobileCommunications (GSM) systems, North American Digital Cellular (NADC)systems, Time Division Multiple Access (TDMA) systems, Extended-TDMA(E-TDMA) systems, Narrowband Advanced Mobile Phone Service (NAMPS)systems, third generation (3G) systems such as Wide-band CDMA (WCDMA),CDMA-2000, Universal Mobile Telephone System (UMTS) systems, and others.

Radio sub-system 200 may be arranged to provide mobile packet datacommunications functionality in accordance with different types ofcellular telephone systems. Examples of cellular telephone systemsoffering mobile packet data communications services may include GSM withGeneral Packet Radio Service (GPRS) systems, CDMA/IxRTT systems,Enhanced Data Rates for Global Evolution (EDGE) systems, Evolution DataOnly/Evolution Data Optimized (EV-DO) systems, Evolution For Data andVoice (EV-DV) systems, High Speed Downlink Packet Access (HSDPA)systems, High Speed Uplink Packet Access (HSUPA) systems, and others.

Radio sub-system 200 may be arranged to provide voice and/or datacommunications functionality in accordance with different types ofwireless network systems. Examples of wireless network systems mayinclude a wireless local area network (WLAN) system, wirelessmetropolitan area network (WMAN) system, wireless wide area network(WWAN) system, and so forth. Examples of suitable wireless networksystems offering data communication services may include the Instituteof Electrical and Electronics Engineers (IEEE) 802.xx series ofprotocols, such as the IEEE 802.11a/b/g/n series of standard protocolsand variants (also referred to as “WiFi”), the IEEE 802.16 series ofstandard protocols and variants (also referred to as “WiMAX”), the IEEE802.20 series of standard protocols and variants, and others.

Radio sub-system 200 may be arranged to perform data communications inaccordance with different types of shorter range wireless systems, suchas a wireless personal area network (PAN) system. One example of asuitable wireless PAN system offering data communication services mayinclude a Bluetooth system operating in accordance with the BluetoothSpecial Interest Group (SIG) series of protocols, including BluetoothSpecification versions v1.0, v1.1, v1.2, v2.0, v2.0 with Enhanced DataRate (EDR), as well as one or more Bluetooth Profiles, and so forth.Other examples may include systems using infrared techniques ornear-field communication techniques and protocols, such aselectromagnetic induction (EMI) techniques. An example of EMI techniquesmay include passive or active radio-frequency identification (RFID)protocols and devices.

Processing sub-system 202 may be responsible for executing varioussoftware programs including system programs such as operating system(OS) 208 and application programs 210. System programs generally mayassist in the running of mobile computing device 100 and may be directlyresponsible for controlling, integrating, and managing the individualhardware components of the computer system. The OS 208 may beimplemented, for example, as one or more of a Palm OS , Palm OS® Cobalt,Microsoft® Windows OS, Microsoft Windows® CE OS, Microsoft Pocket PC OS,Microsoft Mobile OS, Symbian OS™, Embedix OS, Linux OS, Binary Run-timeEnvironment for Wireless (BREW) OS, JavaOS, a Wireless ApplicationProtocol (WAP) OS, or other suitable OS in accordance with the describedembodiments. Mobile computing device 100 may comprise other systemprograms such as device drivers, programming tools, utility programs,software libraries, application programming interfaces (APIs), and soforth.

Application programs 210 generally may allow a user to accomplish one ormore specific tasks. In various implementations, application programs210 may provide one or more graphical user interfaces (GUIs) tocommunicate information between mobile computing device 100 and a user.In some embodiments, application programs 210 may comprise upper layerprograms running on top of the OS 208 that operate in conjunction withthe functions and protocols of lower layers including, for example, atransport layer such as a Transmission Control Protocol (TCP) layer, anetwork layer such as an Internet Protocol (IP) layer, and a link layersuch as a Point-to-Point (PPP) layer used to translate and format datafor communication.

Examples of application programs 210 may include, without limitation,messaging applications, web browsing applications, personal informationmanagement (PIM) applications (e.g., contacts, calendar, scheduling,tasks), word processing applications, spreadsheet applications, databaseapplications, media applications (e.g., video player, audio player,multimedia player, digital camera, video camera, media management),gaming applications, and so forth. It is also to be appreciated thatmobile computing device 100 may implement other types of applications inaccordance with the described embodiments.

Messaging applications may be arranged to communicate various types ofmessages in a variety of formats. Each messaging application may berepresentative of a particular kind of transport, enabling handling ofmessages of particular types and formats for the particular application.The messaging applications may comprise, for example, a telephoneapplication such as a cellular telephone application, a Voice overInternet Protocol (VoIP) application, a Push-to-Talk (PTT) application,and so forth. The messaging applications may further comprise avoicemail application, a facsimile application, a video teleconferencingapplication, an IM application, an e-mail application, a Short MessageService (SMS) application, and a Multimedia Messaging (MMS) application.It is to be understood that the embodiments are not limited in thisregard and that the messaging applications may include any other type ofmessaging or communications application in accordance with the describedembodiments.

Radio sub-system 200 and processing sub-system 202 may comprise one ormore processors and one or more types of memory for performingoperations in accordance with the described embodiments. Examples of aprocessor may include, without limitation, a central processing unit(CPU), general purpose processor, dedicated processor, chipmultiprocessor (CMP), communications processor, radio processor,baseband processor, network processor, media processor, digital signalprocessor (DSP), media access control (MAC) processor, input/output(I/O) processor, embedded processor, co-processor, microprocessor,controller, microcontroller, application specific integrated circuit(ASIC), field programmable gate array (FPGA), programmable logic device(PLD), or other suitable processing device in accordance with thedescribed embodiments.

Memory may comprise various types of computer-readable media capable ofstoring data such as volatile or non-volatile memory, removable ornon-removable memory, erasable or non-erasable memory, writeable orre-writeable memory, and so forth. Examples of computer-readable storagemedia may include, without limitation, random-access memory (RAM),dynamic RAM (DRAM), Double-Data-Rate DRAM (DDRAM), synchronous DRAM(SDRAM), static RAM (SRAM), read-only memory (ROM), programmable ROM(PROM), erasable programmable ROM (EPROM), electrically erasableprogrammable ROM (EEPROM), flash memory (e.g., NOR or NAND flashmemory), content addressable memory (CAM), polymer memory (e.g.,ferroelectric polymer memory), phase-change memory, ovonic memory,ferroelectric memory, silicon-oxide-nitride-oxide-silicon (SONOS)memory, magnetic or optical cards, or any other suitable type ofcomputer-readable media in accordance with the described embodiments. Itcan be appreciated that memory may be separate from a processor or maybe included on the same integrated circuit as a processor. In somecases, some portion or the entire memory may be disposed on anintegrated circuit or other medium (e.g., hard disk drive, memory card)external to radio sub-system 200 and/or processing sub-system 202 andaccessible via a memory bus.

In various embodiments, mobile computing device 100 may comprise a dualprocessor architecture including a radio processor implemented by radiosub-system 200 and a host processor implemented by processing sub-system202. In such embodiments, the radio processor may be implemented as acommunications processor using any suitable processor or logic device,such as a modem processor or baseband processor. The host processor maybe implemented as a host CPU using any suitable processor or logicdevice, such as a as a general purpose processor. Although someembodiments may be described as comprising a dual processor architecturefor purposes of illustration, it is worthy to note that mobile computingdevice 100 may comprise any suitable processor architecture and/or anysuitable number of processors in accordance with the describedembodiments.

FIG. 3 illustrates a block diagram of one embodiment of radio sub-system200 as described with reference to FIG. 2. Radio sub-system 200 mayperform voice and/or data communication operations for mobile computingdevice 100. For example, radio sub-system 200 may be arranged tocommunicate voice information and/or data information over one or moreassigned frequency bands of a wireless communication channel.

As shown in FIG. 3, radio sub-system 200 may comprise a radio processor300. In various embodiments, radio processor 300 may be implemented as acommunications processor using any suitable processor or logic device,such as a modem processor or baseband processor. Radio processor 300 maybe arranged to perform analog and/or digital baseband operations such asdigital-to-analog conversion (DAC), analog-to-digital conversion (ADC),modulation, demodulation, encoding, decoding, encryption, decryption,and so forth. Radio processor 300 may comprise both analog and digitalbaseband sections. The analog baseband section may include I & Qfilters, analog-to-digital converters, digital-to-analog converters,audio circuits, and other circuits. The digital baseband section mayinclude one or more encoders, decoders, equalizers/demodulators,Gaussian Minimum Shift Keying (GSMK) modulators, GPRS ciphers,transceiver controls, automatic frequency control (AFC), automatic gaincontrol (AGC), power amplifier (PA) ramp control, and other circuits.

Radio sub-system 200 may comprise a subscriber identity module (SIM) 302coupled to the radio processor 300. SIM 302 may comprise, for example, aremovable or non-removable smart card arranged to encrypt voice and datatransmissions and to store user-specific data for allowing a voice ordata communications network to identify and authenticate the user. SIM302 also may store data such as personal settings specific to the user.In various embodiments, SIM 302 may be implemented as an UMTS universalSIM (USIM) card or a CDMA removable user identity module (RUIM) card. Insome implementations, SIM 302 may comprise a SIM application toolkit(STK) comprising a set of programmed commands for enabling the SIM 302to perform various functions and/or to independently control aspects ofmobile computing device 100.

Radio sub-system 200 may comprise a transceiver module 304 coupled tothe radio processor 300. Transceiver module 304 may comprise one or moretransceivers arranged to communicate using different types of protocols,communication ranges, operating power requirements, RF sub-bands,information types (e.g., voice or data), use scenarios, applications,and so forth. In various embodiments, transceiver module 304 maycomprise one or more transceivers arranged to support voicecommunication for a cellular telephone system such as a GSM, UMTS,and/or CDMA system.

Transceiver module 304 also may comprise one or more transceiversarranged to perform data communications in accordance with one or morewireless communications protocols such as WWAN protocols (e.g., GSM/GPRSprotocols, CDMA/IxRTT protocols, EDGE protocols, EV-DO protocols, EV-DVprotocols, HSDPA protocols, etc.), WLAN protocols (e.g., IEEE802.11a/b/g/n, IEEE 802.16, IEEE 802.20, etc.), PAN protocols, Infraredprotocols, Bluetooth protocols, EMI protocols including passive oractive RFID protocols, and so forth. In some embodiments, transceivermodule 304 may comprise a Global Positioning System (GPS) transceiver tosupport position determination and/or location-based services.

Transceiver module 304 may be implemented using one or more chips asdesired for a given implementation. In various embodiments, transceivermodule 304 may include multiple transceivers and associated hardwareand/or software components implemented in a single integrated package ormodule, such as on the same die, package or PCB. Although thetransceiver module 304 may be shown as being separate from and externalto radio processor 300 for purposes of illustration, it is worthy tonote that in various embodiments some portion or the entire transceivermodule 304 may be included on the same integrated circuit as the radioprocessor 300.

Transceiver module 304 may be coupled to an antenna system 306 through apower amplifier (PA) 308. PA 308 may be arranged to work in allfrequency bands and/or modulation modes supported by transceiver module304. PA 308 may be used to provide conducted power P_(c) to antennasystem 306 and to amplify signals to be transmitted over wireless sharedmedia.

Antenna system 306 may be arranged to transmit and receive electricalsignals and may be implemented as one or more internal antennas,external antennas, or a combination of both. Although FIG. 3 illustratesa single antenna for purposes of clarity, it may be appreciated thatantenna system 306 may comprise multiple antennas in the form an antennaarray. Multiple antennas may be desirable when implementing spatialdiversity techniques (e.g., beamforming) and/or high-throughputMultiple-Input-Multiple-Output (MIMO) systems (e.g., 802.11n and 802.16esystems).

Antenna system 306 may transmit and/or receive electrical signals viawireless shared media such as one or more bands or sub-bands of RFspectrum. During transmission, antenna system 306 may accept energy froma transmission line and radiate energy into space via a wireless sharedmedia. During reception, antenna system 306 may gather energy from anincident wave received over the wireless shared media, and provideenergy to a corresponding transmission line. In various embodiments,antenna system 306 may operate in accordance with a desired VoltageStanding Wave Ratio (VSWR) value related to the impedance match of anantenna feed point and a conducting transmission line. To radiate RFenergy with minimum loss and/or to pass received RF energy to a receiverwith minimum loss, antenna impedance may need to be matched to theimpedance of the conducting transmission line.

Antenna system 306 may be tuned for operating at one or more frequencybands. In some embodiments, mobile computing device 100 may beimplemented as a multi-band wireless device supporting operation inmultiple frequency bands. In addition, antenna system 306 may be used toimplement various spatial diversity techniques to improve communicationof wireless signals across one or more frequency bands of wirelessshared media such as EV-DO diversity at both the cellular band andPersonal Communications Service (PCS) band.

In various embodiments, the antenna system 306 may allow mobilecomputing device 100 to operate in one or more frequency bands for GSMcommunication such as the 850 MHz frequency band (GSM-850), the 900 MHzfrequency band (GSM-900), the 1800 MHz frequency band (GSM-1800), and/orthe 1900 MHz frequency band (GSM-1900), as defined by the EuropeanTelecommunications Standards Institute (ETSI). In the United States,GSM-850 (cellular) and GSM-1900 (PCS) typically are used for GSMservice. In many international countries, GSM-900 and GSM-1800 (DCS) areused for GSM service. Extended GSM (L-GSM) and Railways GSM (GSM-R) arevariants included in the GSM-900 specification that provide extendedcoverage and additional channels.

Although some embodiments may be described in the context of GSMcommunication for purposes of illustration, it can be appreciated thatthe power saving systems and techniques described herein may be employedfor other types of cellular telephone systems such as CDMA systems, UMTSsystems, NADC systems, TDMA systems, L-TDMA systems, NAMPS systems, andso forth.

As shown, the antenna system 306 may radiate an amount of power referredto as total radiation power (TRP). In general, the TRP of the mobilecomputing device 1100 is the sum of all power radiated by the antennasystem 306 regardless of direction or polarization. In order to maintaindesired communication quality, most carriers establish minimum over theair threshold requirements for TRP. For example, some GSM networkcarriers require a 22 dBm minimum TRP threshold at cellular band and a24.5 dBm minimum TRP threshold at PCS band. In general, if the TRP ofthe mobile computing device 1100 meets or exceeds the minimum TRPthreshold required by the network, the mobile computing device 100 willreceive good quality of service (QoS). If the TRP of the mobilecomputing device 100 is below the minimum TRP threshold required by thenetwork, more power must be input into the antenna system 306 from thebattery to obtain the same QoS.

In one or more embodiments, the mobile computing device 100 may beimplemented as a GSM handheld device designed to operate in the cellularband for a network carrier requiring a 22 dBm minimum TRP threshold. TheTRP of the mobile computing device 100 is a function of the conductedpower P_(c) input into antenna system 306 as well as impedance mismatchof the antenna system 306 and radiation efficiency of antenna system306. In some cases, the mobile computing device 100 may be arranged tosupply 32 dBm of conducted power P_(c) to antenna system 306 resultingin 23 dBm TRP when the mobile computing device is in the talk position(e.g., against the head of the user) and 24 dBm TRP in free space (e.g.,hands-free environment). It can be appreciated that when the mobilecomputing device 100 is held in the talk position, energy radiating fromthe mobile computing device 100 is absorbed by the head of the user. Thehuman head is a lossy dielectric material and typically may absorb 1-6dB energy radiating from a portable device.

When providing 23 dBm TRP in talk position and 24 dBm TRP in free space,the mobile computing device 100 may exceed the 22 dBm minimum TRPthreshold required by the network carrier and receive good QoS in alluser environments. Traditionally, the conducted power P_(c) of a GSMdevice remains the same in all user environments, whether in talkposition or in free space. In such cases, however, excess TRP above theminimum TRP threshold established by the network carrier is provided atthe expense of battery life.

In one or more embodiments, the mobile computing device 100 may achievepower savings by setting different power levels based on userenvironment. For example, the mobile computing device 100 may bearranged to determine a user environment by detecting antenna impedancewhich varies according to the proximity of the mobile computing device100 to the user. The mobile computing device 100 may adjust or select aparticular power level depending on the user environment to save powerwhile maintaining acceptable QoS.

In various embodiments, the radio sub-system 200 may comprise impedancesense circuitry 310 designed to detect the antenna impedance of theantenna system 306. Impedance sense circuitry 310 may be arranged tocontinuously, periodically, and/or responsively detect antennaimpedance. Impedance sense circuitry 310 may be implemented within themobile computing device 100 by impedance bridge circuitry, impedancemeter circuitry, antenna analyzer circuitry, radiometer circuitry,circuitry elements (resistors, inductors, capacitors), transformers,(coaxial or microstrip), and/or other suitable circuitry in accordancewith the described embodiments.

Antenna impedance detected by the impedance sense circuit 310 may varybased on user environment. For example, antenna impedance detected bythe impedance sense circuit 310 will be higher in free space when thehead of the user is relatively far away from the mobile computing device100 than when the mobile computing device 100 is positioned against headof the user. The antenna impedance detected by the impedance sensecircuit 310 changes and becomes lower as the handheld is moved closer tothe head of the user.

As shown, radio sub-system 200 may comprise or implement a power controlmodule (PCM) 312. In various embodiments, PCM 312 may be implemented byone or more hardware components, software components, and/or combinationthereof. For example, PCM 312 may be implemented by power control logic(e.g., instructions, data, and/or code) such as software to be executedby a logic device (e.g., radio processor 300). The power control logicmay be stored internally or externally to a logic device on one or moretypes of computer-readable storage media such as memory 314. Althoughthe memory 314 may be shown as being separate from and external to theradio processor 300 for purposes of illustration, it is worthy to notethat in various embodiments some portion or the entire memory 314 may beincluded on the same integrated circuit as radio processor 300. It alsocan be appreciated that power control logic may be stored by other typesof computer-readable media and executed by other types of logic devicesimplemented by mobile computing device 100.

In operation, PCM 312 may implement power saving techniques for themobile computing device 100. In various embodiments, PCM 312 may bearranged to determine a user environment or the proximity of the mobilecomputing device 100 to the user based on antenna impedance detected bythe impedance sense circuitry 310. For example, PCM 312 may calculate orderive the distance between the mobile computing device 100 and the headof the user according to the detected antenna impedance.

After the user environment is determined, PCM 312 may confirm that TRPfor the mobile computing device 100 at an initial conducted power levelexceeds the minimum TRP threshold required by the network carrier toreceive acceptable QoS for the particular user environment. For example,at a conducted power P_(c) level of 32 dBm, a GSM handheld device may bedesigned to provide 23 dBm TRP in talk position and 24 dBm TRP in freespace both of which exceed the 22 dBm minimum TRP threshold required bya GSM network carrier at cellular band.

Based on the excess TRP for the particular user environment (e.g., 1 dBMin talk position, 2 dBM in free space), PCM 312 may determine a reducedconducted power level (e.g., 31 dBM in talk position, 3 dBM in freespace) to be input to antenna system 306. In various embodiments, thereduced power level may result in the mobile computing device 100providing a reduced TRP that at least meets a specific TRP threshold(e.g., 22 dBM minimum TRP threshold) to achieve an acceptable or desiredQoS. It can be appreciated that in some embodiments, the specific TRPthreshold may be higher than the minimum TRP threshold of networkcarrier.

The mobile computing device 100 may be arranged to control or limit theamount of power drained from or supplied by the battery to input thereduced conducted power level to antenna system 306 and achieve thespecific TRP threshold. In various embodiments, the PCM 312 may instructradio processor 300 to control or limit power drained from or suppliedby the battery in the power management system 206.

When implemented as a GSM handheld device designed to operate in thecellular band for a network carrier requiring a 22 dBm minimum TRPthreshold, the mobile computing device 100 may reduce conducted powerfrom 32 dBM to 31 dBM in talk position to achieve 21% power savingswhile providing 22 dBm TRP and still maintaining acceptable QoS. In freespace, the mobile computing device 100 may reduce conducted power from32 dBM to 30 dBM to achieve 34% power savings while providing 22 dBm TRPand maintaining acceptable QoS.

Although some embodiments may be described in the context of a GSMhandheld device for purposes of illustration, it can be appreciated thatthe power saving systems and techniques described herein may be employedfor handheld CDMA devices, handheld UMTS devices, or any other type ofdevice in accordance with the described embodiments. In addition, whilesome embodiments may be described with respect to distance between ahandheld device and the head of the user, it can be appreciated that thedescribed power saving systems and techniques may be employed for ahand-touch device such as a PDA or other mobile computing device whereclose proximity of the hand of a user may result in radiated energyabsorption.

FIG. 4 illustrates a graphical depiction of antenna impedance withrespect to distance (d) between a GSM handheld device (e.g., mobilecomputing device 100) and the head of the user in accordance with one ormore embodiments. FIG. 4 also shows reduced conducted power levelsimplemented by GSM handheld device when in free space (point A) and intalk position (point B). It can be appreciated that exemplary values areprovided for purposes of illustration and not limitation.

In this embodiment, detected antenna impedance is 98 ohms in free spaceat point A when the head of the user is relatively far away from thehandheld device (e.g., d=20 mm). As shown by the graph, antennaimpedance changes and becomes lower as the handheld device is movedcloser to the head of the user. When the handheld is positioned againsthead (e.g., d=0) at point B, detected antenna impedance is 66 ohms.

At point A, the detected antenna impedance is 98 ohms indicating thatthe handheld is in free space. In free space, the handheld may provide24 dBm TRP at 32 dBm conducted power which may exceed the 22 dBm minimumTRP threshold required by a GSM network carrier at cellular band by 2dB. In this case, the handheld device may reduce conducted power to 30dBm based on the excess TRP for the particular user environment saving34% power.

At point B, the detected antenna impedance is 66 ohms indicating thatthe handheld is in talk position. In talk position, the handheld mayprovide 23 dBm TRP at 32 dBm conducted power which may exceed the 22 dBmminimum TRP threshold required by a GSM network carrier at cellular bandby 1 dB. In this case, the handheld device may reduce conducted power to31 dBm based on the excess TRP for the particular user environmentsaving 21% power.

For a particular user environment or distance at any point between pointA and point B, a linear algorithm or other suitable methodology may beemployed to calculate the amount of conducted power to input into anantenna. In various implementations, detected impedance values betweenpoint A and point B may be divided into several sections and associatedwith different reduced power levels. The embodiments are not limited inthis context.

In some implementations, power saving techniques may be provided on aconfigurable, selectable, and/or optional basis. For example, if batterylife is above a certain level (e.g., 50% power), a constant conductedpower level (e.g., initial 32 dBm conducted power level or 31 dBmreduced conducted power level in talk position) may be supplied to anantenna regardless of the user environment or proximity of the handhelddevice to the user. If battery life falls below a certain level,conducted power may be gradually or severely reduced to save more power.

FIG. 5 illustrates a block diagram of one embodiment of radio sub-system200 as described with reference to FIG. 2. Radio sub-system 200 mayperform voice and/or data communication operations for mobile computingdevice 100. As shown in FIG. 5, radio sub-system 200 may comprise aradio processor 300, SIM 302, transceiver module 304, antenna system306, PA 308 which may be implemented as described above.

Power savings may be achieved by setting different power levels based onuser environment. As described above, antenna impedance varies accordingto the proximity of the mobile computing device 100 to the user. At thesame time, antenna impedance variation may lead to mismatching betweenantenna system 306 and power amplifier 308. Such mismatching will causea change in the current drained from the battery of power managementsub-system 206.

In this embodiment, the mobile computing device 100 may be arranged todetermine a user environment by detecting current which varies accordingto the proximity of the mobile computing device 100 to the user. Themobile computing device 100 may adjust or select a particular powerlevel depending on the user environment to save power while maintainingacceptable QoS. In various implementations, the mobile computing device100 may be arranged to determine and compensate for the effect ofantenna impedance mismatch.

As shown, the radio sub-system 200 may comprise current sense circuitry316 designed to detect the current drained from the battery of powermanagement sub-system 206. Current sense circuitry 316 may be arrangedto continuously, periodically, and/or responsively detect currentconsumption. Current detected by the current sense circuit 316 may varybased on user environment. For example, as the handheld is moved closerto the head of the user, there is greater impedance mismatch (e.g.,higher VSWR) and current detected by the current sense circuit 316 willbe higher than when the handheld is in free space. Current sensecircuitry 316 may be implemented within the mobile computing device 100by a resistor (e.g., 0.2Ω resistor) and an ADC arranged to measurevoltage drop across the resistor, current meter circuitry, circuitryelements (resistors, inductors, capacitors), and/or other suitablecircuitry in accordance with the described embodiments.

Radio sub-system 200 may comprise or implement PCM 312 in memory 314. Inoperation, PCM 312 may implement power saving techniques for the mobilecomputing device 100. In various embodiments, PCM 312 may be arranged todetermine a user environment or the proximity of the mobile computingdevice 100 to the user based on current detected by the current sensecircuitry 316. For example, PCM 312 may calculate or derive the distancebetween the mobile computing device 100 and the head of the useraccording to the detected current.

After the user environment is determined, PCM 312 may confirm that TRPfor the mobile computing device 100 at an initial conducted power levelexceeds the minimum TRP threshold required by the network carrier toreceive acceptable QoS for the particular user environment. Based on theexcess TRP for the particular user environment (e.g., 1 dBM in talkposition, 2 dBM in free space), PCM 312 may determine a reducedconducted power level (e.g., 31 dBM in talk position, 3 dBM in freespace) to be input to antenna system 306. The reduced power level mayresult in mobile computing device 100 providing a reduced TRP that atleast meets a specific TRP threshold (e.g., 22 dBM minimum TRPthreshold) to achieve an acceptable or desired QoS.

The mobile computing device 100 may be arranged to control or limit theamount of power drained from or supplied by the battery to input thereduced conducted power level to antenna system 306 and achieve thespecific TRP threshold. In various embodiments, PCM 312 may instructradio processor 300 to control or limit power drained from or suppliedby the battery in the power management system 206.

When implemented as a GSM handheld device designed to operate in thecellular band for a network carrier requiring a 22 dBm minimum TRPthreshold, the mobile computing device 100 may reduce conducted powerfrom 32 dBM to 31 dBM in talk position to achieve power savings whileproviding 22 dBm TRP and still maintaining acceptable QoS. In freespace, the mobile computing device 100 may reduce conducted power from32 dBM to 30 dBM to achieve power savings while providing 22 dBm TRP andmaintaining acceptable QoS.

It can be appreciated that the power saving systems and techniquesdescribed herein may be employed for handheld GSM devices, handheld CDMAdevices, handheld UMTS devices, or any other type of device inaccordance with the described embodiments. In addition, the describedpower saving systems and techniques may be employed for a hand-touchdevice such as a PDA or other mobile computing device where closeproximity of the hand of a user may result in radiated energyabsorption.

FIG. 6 illustrates a block diagram of one embodiment of radio sub-system200 as described with reference to FIG. 2. Radio sub-system 200 mayperform voice and/or data communication operations for mobile computingdevice 100. As shown in FIG. 6, radio sub-system 200 may comprise aradio processor 300, SIM 302, transceiver module 304, antenna system306, PA 308 which may be implemented as described above.

Power savings may be achieved by setting different power levels based onuser environment. As described above, the proximity of the mobilecomputing device 100 to the user may cause a change in the currentdrained from the battery of power management sub-system 206. The mobilecomputing device 100 may determine a user environment by detectingcurrent which varies according to the proximity of the mobile computingdevice 100 to the user. The mobile computing device 100 may adjust orselect a particular power level depending on the user environment tosave power while maintaining acceptable QoS. In various implementations,the mobile computing device 100 may be arranged to determine andcompensate for the effect of antenna impedance mismatch.

In this embodiment, power management sub-system 206 may comprise currentsense circuitry 316 designed to detect the current drained from thebattery. Current sense circuitry 316 may be arranged to continuously,periodically, and/or responsively detect current consumption. Currentdetected by the current sense circuit 316 may vary based on userenvironment. For example, as the handheld is moved closer to the head ofthe user, current detected by the current sense circuit 316 will behigher than when the handheld is in free space.

Current sense circuitry 316 may be implemented within the powermanagement sub-system 206 by one or more ICs, chips, chipsets, and/orcircuitry. In some embodiments, for example, the current sense circuitry316 may comprise a gas gauge implemented by, or interfaced with, thebattery pack within power management sub-system 206. The gas gauge maycomprise, for example, an IC, chip or chipset arranged to interface withthe battery pack and to measure current flow into and out of thebattery. In such embodiments, the gas gauge may be interrogated at anytime to determine current consumption, capacity, remaining power of thebattery, and/or other parameters. In other embodiments, the currentsense circuitry 316 may comprise or form part of a power management IC,chip or chipset arranged to interface with the battery and to controlpower supply, battery charging, and other power related functions formobile computing device 100.

Radio sub-system 200 may comprise or implement PCM 312 in memory 314. Inoperation, PCM 312 may implement power saving techniques for the mobilecomputing device 100. In various embodiments, PCM 312 may instruct radioprocessor 300 to interrogate current sense circuitry 316 in powermanagement system 206 to detect current and/or determine currentconsumption. In some implementations, the current detected by currentsense circuitry 316 may correspond to the current consumption of radiosub-system 200. In other implementations, the current detected bycurrent sense circuitry 316 may correspond to the total currentconsumption of mobile computing device 100. In such cases, the currentconsumption for radio sub-system 200 may be determined by subtractingknown or expected current consumption values for other components fromthe total current being consumed by mobile computing device 100.

In various embodiments, PCM 312 may be arranged to determine a userenvironment or the proximity of the mobile computing device 100 to theuser based on current detected by the current sense circuitry 316. Forexample, the PCM 312 may calculate or derive the distance between themobile computing device 100 and the head of the user according to thedetected current.

After the user environment is determined, the PCM 312 may confirm thatTRP for the mobile computing device 100 at an initial conducted powerlevel exceeds the minimum TRP threshold required by the network carrierto receive acceptable QoS for the particular user environment. Based onthe excess TRP for the particular user environment (e.g., 1 dBM in talkposition, 2 dBM in free space), the PCM 312 may determine a reducedconducted power level (e.g., 31 dBM in talk position, 3 dBM in freespace) to be input to antenna system 306. The reduced power level mayresult in mobile computing device 100 providing a reduced TRP that atleast meets a specific TRP threshold (e.g., 22 dBM minimum TRPthreshold) to achieve an acceptable or desired QoS.

The mobile computing device 100 may be arranged to control or limit theamount of power drained from or supplied by the battery to input thereduced conducted power level to antenna system 306 and achieve thespecific TRP threshold. In various embodiments, the PCM 312 may instructradio processor 300 to control or limit power drained from or suppliedby the battery in the power management system 206.

When implemented as a GSM handheld device designed to operate in thecellular band for a network carrier requiring a 22 dBm minimum TRPthreshold, the mobile computing device 100 may reduce conducted powerfrom 32 dBM to 31 dBM in talk position to achieve power savings whileproviding 22 dBm TRP and still maintaining acceptable QoS. In freespace, the mobile computing device 100 may reduce conducted power from32 dBM to 30 dBM to achieve power savings while providing 22 dBm TRP andmaintaining acceptable QoS.

It can be appreciated that the power saving systems and techniquesdescribed herein may be employed for handheld GSM devices, handheld CDMAdevices, handheld UMTS devices, or any other type of device inaccordance with the described embodiments. In addition, the describedpower saving systems and techniques may be employed for a hand-touchdevice such as a PDA or other mobile computing device where closeproximity of the hand of a user may result in radiated energyabsorption.

FIG. 7 illustrates a block diagram of one embodiment of radio sub-system200 as described with reference to FIG. 2. Radio sub-system 200 mayperform voice and/or data communication operations for mobile computingdevice 100. As shown in FIG. 7, radio sub-system 200 may comprise aradio processor 300, SIM 302, transceiver module 304, antenna system306, PA 308, and impedance sense circuitry 310, which may be implementedas described above.

Power savings may be achieved by setting different power levels based onuser environment. For example, the mobile computing device 100 may bearranged to determine a user environments by detecting antenna impedancewhich varies according to the proximity of the mobile computing device100 to the user. The mobile computing device 100 may adjust or select aparticular power level depending on the user environment to save powerwhile maintaining acceptable QoS.

As described above, antenna impedance varies according to the proximityof the mobile computing device 100 to the user. At the same time,antenna impedance variation may lead to mismatching between antennasystem 306 and power amplifier 308. In general, antenna impedancematches well with PA 308 in free space, but not in talk position. Talkposition is the worst case of all user environments where the head ofthe user absorbs the maximum power from the mobile computing device 100.In contrast, the head of the user absorbs the minimum power from themobile computing device 100 in free space.

Impedance sense circuitry 310 may be arranged to continuously,periodically, and/or responsively detect antenna impedance, and PCM 312may be arranged to determine a user environment or the proximity of themobile computing device 100 to the user based on antenna impedancedetected by the impedance sense circuitry 310.

In this embodiment, the radio sub-system 200 may comprise a matchingswitch system 318 within the mobile computing device 100 designedautomatically adjust antenna matching in different user environment inorder to maintain the minimum conducted power and extend battery life.Matching switch system 318 may be implemented by various circuitryelements (resistors, inductors, and capacitors), diodes, transformers,and/or other suitable circuitry in accordance with the describedembodiments. Components or groups of components within the matchingswitch system 318 may be continuously, periodically, and/or responsivelyadjusted on an individual or group basis to compensate for antennaimpedance mismatch.

As shown, matching switch system 318 may comprise a switch controller(SC) 320 arranged to mechanically or otherwise switch among two or morematching circuitries including a first matching circuitry (MC1) 321 anda second matching circuitry (MC2) 322. In various embodiments, MC1 321may be used for a first user environment (e.g., free space) and MC2 322may be used for a second user environment (e.g., talk position). In suchembodiments, MC2 322 may comprise matching circuitry designed tocompensate for antenna impedance mismatch. It can be appreciated thatwhile MC1 321 and MC2 322 are shown for purposes of illustration,matching switch system 318 may include addition matching circuitriesassociated with different user environments in accordance with thedescribed embodiments.

After the user environment is determined, the SC 320 may be arranged toautomatically adjust and/or improve antenna impedance matching. Forexample, if the detected antenna impedance is 98 ohms indicating thatthe handheld is in free space, there is relatively good impedancematching between antenna system 306 and PA 308. SC 320 may switch orconnect to MC1. In free space, the handheld may provide 24 dBm TRP at 32dBm conducted power which may exceed the 22 dBm minimum TRP thresholdrequired by a GSM network carrier at cellular band by 2 dB. In thiscase, the handheld device may reduce conducted power to 30 dBm based onthe excess TRP for the particular user environment to achieve powersavings.

If the antenna impedance detected by the impedance sense circuitry 310is 66 ohms indicating that the handheld is in talk position, there ismismatching between antenna system 306 and PA 308. SC 320 may switch orconnect to MC2 to provide better antenna impedance matching. In talkposition, the handheld may exceed the minimum TRP threshold by 1 dB, andmatching switch system 318 may provide better antenna impedancematching. In this case, the handheld device may reduce conducted powerto 30 dBm based on the excess TRP and improved antenna impedancematching for the particular user environment to achieve power savings.

When implemented as a GSM handheld device designed to operate in thecellular band for a network carrier, mobile computing device 100 mayreduce conducted power from 32 dBM to 30 dBM in talk position as well asin free space to achieve power savings while providing 22 dBm TRP andmaintaining acceptable QoS.

It some embodiments, user environment or the proximity of the mobilecomputing device 100 to the user may be determined based on currentdetected by current sense circuitry 316. Accordingly, in suchembodiments, the matching switch system 318 may be used in conjunctionwith current sense circuitry 316 to provide improved antenna impedancematching and power savings.

It can be appreciated that the power saving systems and techniquesdescribed herein may be employed for handheld GSM devices, handheld CDMAdevices, handheld UMTS devices, or any other type of device inaccordance with the described embodiments. In addition, the describedpower saving systems and techniques may be employed for a hand-touchdevice such as a PDA or other mobile computing device where closeproximity of the hand of a user may result in radiated energyabsorption.

FIG. 8 illustrates a power control logic flow 800 in accordance with oneor more embodiments. The logic flow 800 may be performed by varioussystems and/or devices and may be implemented as hardware, software,and/or any combination thereof, as desired for a given set of designparameters or performance constraints. For example, the logic flow 800may be implemented by a logic device (e.g., processor) and/or logiccomprising instructions, data, and/or code to be executed by a logicdevice.

The logic flow 800 may comprise determining a user environment (block802). In some embodiments, the user environment may be determined basedon detected antenna impedance which varies according to the proximity ofa mobile computing device 100 to a user. For example, detected antennaimpedance will be higher in free space when the head of the user isrelatively far away from the mobile computing device 100 than when themobile computing device 100 is positioned against head of the user. Thedetected antenna impedance changes and becomes lower as the mobilecomputing device 100 is moved closer to the head of the user.

In some embodiments, the user environment may be determined based ondetected current which varies according to the proximity of the mobilecomputing device 100 to a user. Antenna impedance variation may lead tomismatching causing a change in the current drained from a battery ofthe mobile computing device. For example, as the mobile computing device100 is moved closer to the head of the user, there is greater impedancemismatch and detected current will be higher than when the mobilecomputing device 100 is in free space.

The logic flow 800 may comprise improving impedance matching (block804). In various embodiments, the mobile computing device mayautomatically adjust and/or improve antenna impedance matching based onuser environment allowing a further reduction in conducted power. Forexample, if the mobile computing device 100 is in free space, there isrelatively good impedance matching. If the mobile computing device 100is in talk position, there is impedance mismatching. In talk position,appropriate matching circuitry may be used to connect to antenna toprovide better antenna impedance matching.

The logic flow 800 may comprise confirming that TRP for the mobilecomputing device 100 at an initial conducted power level exceeds aminimum TRP threshold (block 806). In various embodiments, the minimumTRP threshold may be established by a network carrier to receiveacceptable QoS. At an initial conducted power level, the mobilecomputing device 100 may be designed to provide TRP which exceeds theTRP threshold required by the network carrier in both talk position andin free space 24 dBm.

The logic flow 800 may comprise determining a reduced conducted powerlevel based on the excess TRP for the particular user environment (block808) and providing the reduced conducted power level to an antennasystem 306 (block 810). In various embodiments, the mobile computingdevice 100 may adjust or select a particular power level depending onthe user environment to save power while maintaining acceptable QoS. Thereduced power level may result in the mobile computing device 100providing a reduced TRP that at least meets a specific TRP threshold(e.g. minimum TRP threshold) to achieve an acceptable or desired QoS.The mobile computing device 100 may be arranged to control or limit theamount of power drained from or supplied by the battery to input thereduced conducted power level to the antenna system and achieve thespecific TRP threshold.

Numerous specific details have been set forth to provide a thoroughunderstanding of the embodiments. It will be understood, however, thatthe embodiments may be practiced without these specific details. Inother instances, well-known operations, components and circuits have notbeen described in detail so as not to obscure the embodiments. It can beappreciated that the specific structural and functional details arerepresentative and do not necessarily limit the scope of theembodiments.

Various embodiments may comprise one or more elements. An element maycomprise any structure arranged to perform certain operations. Eachelement may be implemented as hardware, software, or any combinationthereof, as desired for a given set of design and/or performanceconstraints. Although an embodiment may be described with a limitednumber of elements in a certain topology by way of example, theembodiment may include more or less elements in alternate topologies asdesired for a given implementation.

It is worthy to note that some embodiments may be described using theexpression “coupled” and “connected” along with their derivatives. Theseterms are not intended as synonyms for each other. For example, someembodiments may be described using the terms “connected” and/or“coupled” to indicate that two or more elements are in direct physicalor electrical contact with each other. The term “coupled,” however, mayalso mean that two or more elements are not in direct contact with eachother, but yet still co-operate or interact with each other. Withrespect to software elements, for example, the term “coupled” may referto interfaces, message interfaces, API, exchanging messages, and soforth.

Various embodiments may comprise one or more functional components ormodules for performing various operations. It can be appreciated thatsuch components or modules may be implemented by one or more hardwarecomponents, software components, and/or combination thereof. Thefunctional components and/or modules may be implemented, for example, bylogic (e.g., instructions, data, and/or code) to be executed by a logicdevice (e.g., processor). Such logic may be stored internally orexternally to a logic device on one or more types of computer-readablestorage media.

It also is to be appreciated that the described embodiments illustrateexemplary implementations, and that the functional components and/ormodules may be implemented in various other ways which are consistentwith the described embodiments. Furthermore, the operations performed bysuch components or modules may be combined and/or separated for a givenimplementation and may be performed by a greater number or fewer numberof components or modules.

Some of the figures may include a flow diagram. Although such figuresmay include a particular logic flow, it can be appreciated that thelogic flow merely provides an exemplary implementation of the generalfunctionality. Further, the logic flow does not necessarily have to beexecuted in the order presented unless otherwise indicated. In addition,the logic flow may be implemented by a hardware element, a softwareelement executed by a processor, or any combination thereof.

Unless specifically stated otherwise, it may be appreciated that termssuch as “processing,” “computing,” “calculating,” “determining,” or thelike, refer to the action and/or processes of a computer or computingsystem, or similar electronic computing device, that manipulates and/ortransforms data represented as physical quantities (e.g., electronic)within registers and/or memories into other data similarly representedas physical quantities within the memories, registers or other suchinformation storage, transmission or display devices.

It also is worthy to note that any reference to “one embodiment” or “anembodiment” means that a particular feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment. The appearances of the phrase “in oneembodiment” in the specification are not necessarily all referring tothe same embodiment.

While certain features of the embodiments have been illustrated asdescribed above, many modifications, substitutions, changes andequivalents will now occur to those skilled in the art. It is thereforeto be understood that the appended claims are intended to cover all suchmodifications and changes as fall within the true spirit of theembodiments.

1. A mobile computing device comprising: a battery to supply power tothe mobile computing device; at least one antenna; and a power controlmodule to determine a user environment of the mobile computing device,confirm that total radiation power (TRP) of the at least one antenna atan initial conducted power level exceeds a minimum threshold TRP, anddetermine a reduced conducted power level to input to the at least oneantenna.
 2. The mobile computing device of claim 1, further comprisingimpedance sense circuitry to detect antenna impedance, the power controlmodule to determine user environment based on detected antennaimpedance.
 3. The mobile computing device of claim 2, wherein detectedantenna impedance is higher in a free space user environment than in atalk position user environment.
 4. The mobile computing device of claim1, further comprising current sense circuitry to detect current suppliedby the battery, the power control module to determine user environmentbased on detected current
 5. The mobile computing device of claim 4,wherein detected current is higher in a talk position user environmentthan in a free space user environment.
 6. The mobile computing device ofclaim 1, wherein the reduced conducted power level input to the at leastone antenna results in a reduced TRP that at least meets the minimumthreshold TRP.
 7. The mobile computing device of claim 6, wherein thereduced TRP exceed the minimum threshold TRP.
 8. The mobile computingdevice of claim 1, wherein user environment is based on proximity of themobile computing device to a user.
 9. The mobile computing device ofclaim 8, wherein user environment is based on distance between themobile computing device and a head of the user.
 10. The mobile computingdevice of claim 1, the reduced power level based on excess TRP.
 11. Themobile computing device of claim 1, the power control module to selectfrom among a plurality of reduced power levels.
 12. The mobile computingdevice of claim 1, further comprising a matching switch system toimprove antenna impedance matching.
 13. The mobile computing device ofclaim 12, the matching switch system comprising a switch controller anda plurality of matching circuitries.
 14. The mobile computing device ofclaim 12, further comprising impedance sense circuitry to detect antennaimpedance, the power control module to determine user environment basedon detected antenna impedance.
 15. The mobile computing device of claim12, further comprising current sense circuitry to detect currentsupplied by the battery, the power control module to determine userenvironment based on detected current.
 16. A method comprising:determining a user environment of a mobile computing device; confirmingthat total radiation power (TRP) of at least one antenna of the mobilecomputing device at an initial conducted power level exceeds a minimumthreshold TRP; and determining a reduced conducted power level to inputto the at least one antenna.
 17. The method of claim 16, furthercomprising detecting antenna impedance and determining user environmentbased on detected antenna impedance.
 18. The method of claim 17, whereindetected antenna impedance is higher in a free space user environmentthan in a talk position user environment.
 19. The method of claim 16,further comprising detecting current and determining user environmentbased on detected current
 20. The method of claim 19, wherein detectedcurrent is higher in a talk position user environment than in a freespace user environment.
 21. The method of claim 16, further comprisingproviding the reduced conducted power level input to the at least oneantenna resulting in a reduced TRP that at least meets the minimumthreshold TRP.
 22. The method of claim 21, wherein the reduced TRPexceed the minimum threshold TRP.
 23. The method of claim 16, furthercomprising determining user environment based on proximity of the mobilecomputing device to a user.
 24. The method of claim 23, furthercomprising determining user environment based on distance between themobile computing device and a head of the user.
 25. The method of claim16, further comprising improving antenna impedance matching.
 26. Acomputer-readable storage medium comprising instructions that ifexecuted enable a computing system to perform the method of claim 16.